The length around a circle is the circumference
The length across a circle is the diameter
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circumrenceThe length around a circle is called the circumference
It depends on what other information you have: area, circumference, radius, length of arc subtending a known angle, measure of angle for a known arc length etc.
The radius of a circle is the length of the line from the center of the circle to any point on its edge.
The diameter of any circle is twice its radius
A chord of a circle is a straight line that joins any two points on the circumference of a circle. The diameter of a circle is the length of the chord that passes through the centre of the circle; it is the chord of longest length and is twice the radius of the circle in length.